The second time Credence lets Graves fuck him is because Graves wants to. He really obviously does, if the marks on his neck and his bloody lips are any indications. And Credence just can't find the energy to put him off - and really why should he when the stubble leaves red burns on his skin and fingerprints that tell a story of some kind - any kind - of love. Love is all Credence is after.
When he comes it's the kind of orgasm that makes his brain crack and splinter into a thousand pieces, the one when you're not able to feel anything except the slight drum of your veins when your mind hums before coming to a rest. Just softness, the pillow on his cheek, eyes heavy, eyes closing.
He doesn't feel Graves get up and leave, and he definitely doesn't feel soft lips between his shoulder blades that murmur his name. He's grateful for it.
The next day an unknown number flashes on his phone.
He ignores it.