surprisingly supportive new step mother?

I think it's a oneshot in a manga.
A high schooler in rebellious phase, coming from a rich family, his father has married and divorced and remarried with young wives several times.
The boy despises his stepmothers because he thinks they're just after his father's money.
One day he fuck his classmate (a good kid, wearing glasses), get caught in the act, and the school has his new stepmother come to the school. The boy wish the glasses guy to say that he was forced but instead, the glasses guy said that they did it on both consents. Surprisingly, the new stepmother supports their relationship.
Anyone remember what manga is this?
thx in advance~ ^_^