Cream and Black have a love-hate relationship. Cream is a pure-blood EZ'NOZ, and her arrogant behavior pisses him off. He hates her deeply. However, she has helped him many times, so he tolerates her. Cream is the only person Black sleeps with often. Otherwise, he only has one-night stands. Unfortunately, Cream is very obnoxious, but when having sex with Black, it often happens that she shows her loving side. However, this makes Black uncomfortable, and he tries to get her off quickly so he can then fuck off.
Many think that Black is asexual or aromatic. But he isn't. He has lust and desires and enjoys intimacy. He likes to wreck his partner in bed and enjoys the sight. But he can also be gentle; depending on how his partner wants it, he can adapt. Because what makes him most horny is when his partner enjoys sex. Still, he only fucks with EZ'NOZ he doesn't like or doesn't know. It is fair to say that he never found true love.
Also, it's just his way of being grumpy. He doesn't like public affection or lovers who are totally cheesy with each other.