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Ginro obviously likes women, he lusts after and goes after them as often as Kinro follows orders, it's a way of life. however, magma is an interest to him, perhaps a bi or gay awakening of some kind.
But Magma doesn't give a shit about him, he's too busy trying to plot for things and get things rolling for his victory. Ginro isn't patient, and he's actually fairly smart when he wants to be ( keyword, wants to )
So to get what he wants he'll just act forcefully. going to Magma's area whilst he's asleep and getting him hard with an untrained tongue and desperation to spare, Magma wakes up when Ginro is trying to spear himself on his cock, understandably he's shocked.
But Ginro says that if he hurts him in any way, or tries speaking out, he will say that he was raped, and get Magma in so much more trouble than it's worth.
( Because no one truly likes Magma all that much, he's brash and angry, while Ginro at least has a brother, has Kohaku, has Ruri to some extent, if word spread Magma would be done for, something he couldn't have happen )
So Magma is forced to please the man above him as many times as he so pleases because a mess up is how Ginro wins. He rather likes the power trip, so he's more than willing to do it again and again to fit that damn grin he wears.
After all a snake only bites when it gets scared