Sweet F. Cake v.1.2 by Texic - Adult Sex Game

An amazing story about a typical Soviet pioneer, whose life was not the best for him: a friend could not stand the test of time, and the girl whom the hero has been in love with since adulthood, sees him as a sister with a adult-bearing organ.
Everything goes to hell until an old man appears who hands a young man an envelope with an artifact that allows him to “replay” the current state of affairs and, possibly, even surpass past successes.
The only thing the owner of the envelope asks for in return is the virginity, from which the protagonist tries so hard to get rid of. Agree or not? It is up to you.