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There's a scene like that in this story. http://www.mangago.zone/read-manga/hana_ni_kuchizuke/mf/manga/hana_ni_kuchizuke/c002/pg-3/
If it's this one, here are related series.
1 Hana ni Kuchizuke
2 Hana to Ikkun
3 Moon and Son [Spin-Off]
4 Hana to Odekake
Ohhhh i read all those above
looking for a manga where the seme got caught by his friends bc his gf sent him a selfie, but actually the gf isn't a gf after all bc he's a boy. theyre are in a secret relationship and they belong in the same circle of friends lmao im sorry if this is confusing