this is all I can remember
guy/seme gets picked up and stays at uke's house caring for uke's grandfather
one night he hears the tv is on and sees the uke masturbating, grandfather tells a story about how the uke was always used by past lovers and we see in high school a boyfriend was saying nasty things to a group about him/uke
uke trys to get rid of the guy/seme and agrees to sleep with him to get him to leave, guy/seme ends up staying as his housewife

Smiles Conceal Knives - Lynn Flewelling.
There is No Such Thing as BAD Words.
[img]http://dragcave.net/image/qzwAT.gif[/img] [img]http://tinyurl.com/n4rj47q/.gif[/img]

found it, 3 of https://www.mangaupdates.com/series.html?id=2735

Smiles Conceal Knives - Lynn Flewelling.
There is No Such Thing as BAD Words.
[img]http://dragcave.net/image/qzwAT.gif[/img] [img]http://tinyurl.com/n4rj47q/.gif[/img]