Ok, so it's a yaoi about a guy (seme) who is a bit frustrated with how his life is going and the expectations thrown at him. One day, another guy (uke) shows up (and I think the uke was like a relative or childhood friend or something?). Anyway, the uke shows up and tells the seme how much he admires him and has looked up to him for so long. Seme gets upset and has sex with the uke, and continues to use the uke to get out his anger, but not in a abusive way.

I think it was a oneshot or extra chapters to another manga. I just remember there being a scene where the uke goes to work wearing a ring and all the female co-workers are gossiping about it and how they think it's a possessive older girlfriend. Then it shows a flashback to uke showing seme a ring he bought and seme says he's not wearing a ring, and the uke says something like "it's not yours, it's mine so everyone knows I belong to you." and uke makes a joke about being a bride.

i think it's Ouji no Kikan by Junko.

But the one who's frustrated with his life is the uke, and his cousin is actually the seme. &the one who bought the ring is actually the seme. well, unless i got the incorrect manga ~

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oh thank you. I totally thought it was the the other way around with the seme and uke. Thank you so much!