This work is literally about a college student randomly knocking on someone's door hoping some woman would have sex with him, yes I'm not joking it is that random, luckily for him a woman answers the door completely naked and just invites him in, they quickly introduce themselves to each other and have sex, the woman Yui Kirihara and the college guy is Masaki Taniguchi.
Masaki is so glad he lucked out with such a beautiful woman accepting his random request, but he is uneasy about Yui being a married woman, wouldn't that be an issue he asks? Yui says it is fine, she hadn't had sex with her husband since their child was born, Masaki can't believe it, if someone as beautiful as Yui was his wife he would never stop touching her, Yui is flattered so let's get into it.
They became sex friends since, later on Yui got pregnant and Masaki is back for another hookup, Masaki admires she has gotten so big and jokes with greeeting her belly by saying daddy is back.
In the Omake Yui says having sex with her husband was so difficult, implicitly to fool him about the pregnancy.
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Please guys, don't tag stuff if you aren't sure, the title can be misleading but that's not an excuse.
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