I am looking for yaoi mangas where seme coveres uke for treason. Seme must sees uke sleeps with other guy (uke has sex with other, best when uke will ride it, but it doesn't have to be)
Please write chapter next to the title

Sorry for my English

Thank you

Do you mean cheating?
Because treason is more of a "you spy on your country and sell their secrets" type thing.

Maybe you can find something here: Caught in the act+infidelity

Or just try those two separately. You might find something nice.

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Yes, I mean cheating

Thank you for your help