What if you combined Nahida's skill and Aki's Fox Devil contract together? pg.5 "Commit it to memory!" pg.32 "Kon!"
Another day, another time-stop(ish) story pulled out of upload purgatory. Released in the tail-end of 2020, this work was made by Hades Code / はぁでぃすこぉど, another artist who hasn't been uploaded onto this site yet.
[Summary after using rudimentary Google Translate:] The story here seems to be that the main guy, Kirita Hario, has a special ability passed genetically through his family where someone can create a stopped space and copy other people by 'closing' them within his fingers. Its similar to time-stop where he enters a pocket dimension and can do whatever he wants without being disturbed, but is more accurate to cloning since it's not the 'real' person he's doing stuff with. (DMM has it listed under time-stop, so vote on if you think it fits or not.) When he uses it on his main target, the third girl named Kirei-chan (literally 'beautiful'), her copy somehow becomes 'sentient'. She dominates him, and Kirita learns that Kirei actually has a crush on him, masturbating to him everyday. The copy then pulls a 'find me when you wake up' on him (even courteously zipping up his pants), and he decides to reciprocate her feelings by confessing. In the end, he seems to have lost his copy ability but gained a happy ending in exchange.