It's hard to say for sure if Gustavain knew it would be something like this or not when he gave him the controller. Certainly, it doesn't seem like something he could have predicted. But they're both more honest like this, in a way-- Gustavain isn't able to hide anything and Phillip certainly seems more free with his affection, knowing that there's not going to be any kind of negative reaction for it.

The bite, the bruise being worked into his skin, causes a low, soft series of noises, rich and warm, and apparently Gustavain can speak like this, it's just rare, because there's a groaned,

"More..." perhaps it's just that that sentiment is very easy to convey.