Sirius huffed with amusement around James' cock, and pulled back slowly letting him slip from his mouth. "You always say the nicest things." He teased, watching James' face while he circled his tongue around the crown.
"I've got you, just let me." Sirius murmured, breath hot against James' skin he could have done it slower, could have done it without the spell but he wanted to be inside him and it was easy to breath the spell against James before taking James into his mouth once again easing the way for his finger as he slid it in.
Sirius took his time then, or as much as Sirius ever really took his time, thrusting slowly with his finger, twisting and curling for several minutes before he added a second. This was always good, before he was so lost in sensation that he couldn't think straight, Sirius could truly enjoy James and the way he opened around his fingers, the way he arched and panted - all of it making it that much harder for Sirius not to drive himself into James in that moment.