https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_297275/

[Synopsis]

The protagonist, Hiroto, was having sex with his girlfriend in her room.
Their voices were completely audible to the girlfriend's mother who was folding laundry in her bedroom.
One day, Hiroto bumped into his girlfriend's mother who was on her way home from shopping, with both hands full.
Hiroto picked up the bags and helped carried them to her house and decided to wait for his girlfriend there.
His girlfriend gets home late due to her club activities, so Hiroto was left alone with her mother.
Hiroto seemed confused by the mother's questions which she would not normally ask in front of her daughter.
The mother then approached him, asking, ''Would you like to see me as a woman?''
Hiroto was instantly turned on by the mother's passionate kiss, which melted him away and the frustrated mother lost track of time as she enjoyed sex with her daughter's boyfriend...

Base +22