http://www.getchu.com/soft.phtml?id=988605
http://www.appetite-game.com/apadash/aptd_010.html

Vndb : https://vndb.org/v22534

Base +6, xxyxc +6, Kanmuri89 +6, observer1980 +21, Rolled +6, Tamaki-Kousaka +8

Why isn't there an option to cum on her while she's doing sit ups?

Base +7, Zetagundam87 +2, observer1980 +21, gorack344 +6, hafini +11, Tamaki-Kousaka +8

The story starts with the protagonist, Kouta Sawatari, arguing with his father, he is mad because his pops is forcing him to use up his summer break on a job he will be hooked up with, Kouta’s father is forcing him to work in his grandfather’s gym, Kouta tries to get his way out of it, telling his dad that he is being a mean ass, destroying his son’s summer break, but Kouta’s father isn’t having none of it, Kouta can’t play the victim because he seemly is goofing around school and isn’t showing good results for his father to let him do what he wants, so Kouta’s father (he has no name) tells him this a good opportunity to help gramps and punish him, two birds with one stone.

At his new job Kouta is there overseeing the people at the gym, one particular person catches his attention, a woman that comes by every day to the gym, a real hard worker and a real spectacle because she is really curvy, sex as hell Kouta thinks, but he doesn’t know her name so he just calls her “Obaa-san/Auntie”, the woman notices Kouta’s gaze on her and approaches him, wanting to know the new face at the Gym; Kouta becomes a nervous guy around the Auntie, and she likes to tease him for that, the Auntie asks Kouta what he is doing there working during a time where summer break should be in effect around schools, Kouta just says due certain circumstance he has to help his gramps at taking care of the gym (he doesn’t say he is being forced to stay there).

Now with both acquainted Auntie keeps requesting Kouta to oversee her gym routine, knowing that her body really is arousing him Auntie catches Kouta masturbating to her, he freaks out and tries to apologise, but Auntie keeps calm and says it’s okay, he is a young man and it’s natural to be horny often at his age, she really eggs on Kouta, pushing him to come out clean about his desires on her, telling him to be honest and touch her; it is no secret Auntie is seducing Kouta to jump on her, while not knowing much about Auntie he at least knows she is married, wondering why she is basically throwing herself at him, but Kouta gives up on all reason, the woman he has been eyeing up wants him to do some skinship together, he isn’t going to refuse, and so as the days go by Kouta and Auntie do some naughty play together, with she telling him to touch her as he masturbates and ejaculates on her body.

Then the narrative cuts once to Auntie’s Point of View, she goes home after one day at the gym where Kouta touched her all over, she masturbates as soon as she comes thinking of said event, we learn her name: Masumi Ukita, and her reasoning for all of this, apparently she is a very horny housewife and one lonely at that, yet again another wife with a husband that is always working and is never home, Masumi has been nurturing a sexual fantasy where she had sex with men other than her husband, with that Kouta has appeared on her life just on time for her to finally act on this play, Masumi knows Kouta is just working there for his summer break, so it seems a perfect chance to have a shot at him then part ways, pretty much pump and dump.

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While we get to know Masumi’s name, it really isn’t important, Kouta will always call her “Obaa-san” (to the point even her text box goes back to “Obaa-san” even after revealing her name) and Masumi herself never refers to Kouta by name, to really enforce this is an affair where both are just having a wild ride, without really wanting to getting any deeper than that.
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After much skinship which eventually became full sexual intercourse, one day after the gym session is over Kouta notices Masumi forgot her member ID card, what he will do with it defines the ending.

------------ Ending 1 – Kouta decides to deliver Masumi’s membership card to her home in the following day.

Kouta gets to know where Masumi lives and goes to deliver her lost membership card, Masumi is thankful towards Kouta and invites Kouta in, of course they have sex around the house, that marks the point where Kouta and Masumi will get hot and heavy at the gym and at her apartment; Masumi clicks on all Kouta’s fantasies such as naked aprons, which during one of these plays Kouta teases Masumi about her husband, what really is her relationship with the man if she is blatantly cheating on him like this, Masumi teases her as she holds her marriage photo, Kouta forces Masumi to tell him how she got with her husband, Masumi says they had a nice meeting and he is a chivalrous man, a very good person and so they married, but apparently being a good man only applies to everything out of bed, they don’t have a fulfilling sex life, and so Kouta forces his teasing on Masumi telling her to apologize (to the photograph) for being such a slut, Masumi does so, screaming apologies to her husband while she cums.

That was all a play on Kouta’s part though, he really doesn’t feel sorry for her husband and asks Masumi if they can keep having this affair for as long as it can, Masumi accepts, and so Kouta and Masumi immerse themselves in this wicked play even after Kouta’s summer break ends as they have sex on Masumi’s bed which she sleeps with her husband, while receiving a call from him, THE END.

------------ Ending 2 – Kouta holds on Masumi’s card, preferring to deliver to her once she comes by the gym without her card in hand.

Kouta gives Masumi’s card back to her, she was worried she had lost it, but all is fine now, Kouta and Masumi have their plays only at the gym, as Kouta never went to her house here; one day Masumi and Kouta get loose enough to they have group sex with other men at the gym having their turn with Masumi, she feels the experience to be great and Kouta finds Masumi ever increasing lewdness while being done in by other men to be sexy.

And so Kouta’s summer break ends, with that his obligation with his father and gramps as well, he stops working at the gym and parted ways with Masumi, here it was just a summer ride for Kouta, he doesn’t ask Masumi to continue the affair, for her it was a one-time ride as well, as it seemly she used her naughty play to improve her life with her husband, THE END

Base +6, dogma +6, subbesnubben +6, Elusi +6, Poinf +8, loganso +7, demanimetiddies +7, Crummydoll +7, Shurikensei +7, dauner +6, JayGray7Ten +7, falytn123 +3, Sirpunishment +6, and 23 more...

@ Goukenimaru
Thanks very much!
But question, what the hell is happening in that gangbang scene? For what reason?

Base +6, observer1980 +21

where i can find bgm sound for this?

Base +5

这么年轻漂亮的阿姨哪里找？

Base +6