Sirius nodded, leaning in to kiss him softly, slowly making sure to convey how much this actually did mean to him. This wasn't just sex to him. It was much more even if he wasn't consciously aware of it at the moment. He had been upset all day before he had sought Remus out and once he finally did he felt better. He could barely even remember why he was upset in the first place now.
Tenderly moving his lips with Remus' own, he reached down to gently grip his hip, pulling him forward a bit on the rolled up towel as he pressed the head of his cock against Remus' opening. Pulling back to look at him, he rested his forehead against the boys and held his gaze as he slowly pushed into him, fingers tightening on his hip as he fought to keep his eyes open. Nothing had ever felt this good before. It was amazing.