What does he mean by that?

Me and this guy were in the middle of doing it and we both have strong sexual chemistry and can’t help but touch each other when we are together. There’s always sexual tension. So he cane to see me at night and we started having sex and he then said “look how hard you make me.” Why did he say this? Is he into me? He even said I do something to him.
What does he mean by that?
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