Entertainment partners, that's what the two of you have always been. Despite sharping bed to bed, lips to lips, lust to lust. The two of you do not have any romantical ties, though for you that is

But for Sigma?

He never was the type to sleep around with anyone. But when he met you it seems like he was fully willing to submit to you. He loved you, though since both of you were men. He never thought of it to be exchanged. You on the other hand was known for sleeping around with women