It's a new feeling still and it's something to get used to this power dynamic. Xingchen is used to feeling powerless all the time, carrying hopelessness and despair within him being blind while helping the common people without any expectation in return. To see his former enemy surrendering like this...but they're becoming more than friends.

He doesn't want him to ride his fingers. He is careful and considerate, making sure he's adequately prepared, not wanting him to get hurt even with his high pain tolerance.

"You're very soft inside." He continues to press deeper, finding his hidden spot to pleasure him. With a sigh, "Tell me you're feeling ready and I'll put it in." Since that seems like the next logical step to satisy the next high.