I vaguely remember two chapters from a volume of (possibly) oneshots. It was about two high school friends, the uke carries around a picture of the person he loves and the seme got jealous over who he likes. The seme sneaks a look at uke's wallet and it turns out the photo was him. That's about all I remember, in the end they end up together?

Much appreciated for any help 🙂

Edit: I found it in the end, to anyone who was interested it was Seito Kaichousama no Pet