Mr. Bo Wants to Be a Third Party for Love Every Day

Please Beg the Male Protagonist to Be the Third Person for Love

I want to read a book like "Standing alone in an empty house for two and a half years, seducing my uncle into conceiving a baby with a kiss". Something like this, the male protagonist plays the third role for love, he is sober and knowledgeable, he is a very good person, and the female protagonist is not bad either