Newt and Percival both keep odd hours, so it's not uncommon for them to be on opposite sleep cycles for days and sometimes weeks at a time. However, through a fair amount of communication and kink negotiation they make it work.

They have a standing rule that if Newt comes to bed and Percival's not wearing any underwear that is considered a declaration that Newt can do what he pleases to Percival's ass. Some nights when Newt is particularly tired he just snuggles up to sleep, rutting gently against Percival's backside until he falls asleep. Other nights he fingers Percival a bit, then slides inside him and just stays there, savoring the hot clench of Percival's body around him until he drifts off.

On the best nights Newt fucks Percival until Percival is dripping with his come. Percival often wakes up a bit on these nights, but most of the time he just spreads his legs a little wider, murmurs "be sure and clean up after yourself" then settles back down to sleep.