ok...I 'm looking for a yaoi manga. The couple going for vacation in an island and the uke...

ok...I 'm looking for a yaoi manga. The couple going for vacation in an island and the uke wants to make the seme jealous so he is cheating on him with the scuba diving teacher (I think) but the last moment he regret it. And I'm not sure but I think that it was seme's plan but I'm not sure. Also I remember that the art was a bit weird. I hope someone help me. (=・ω・=)