The sharpness of those fangs is a small blessing, piercing efficiently and without tearing, which is absolutely the best experience he's had with teeth meeting dick in his century of life. The most enjoyable experience too, even if he's not sure he'd have ever considered getting his dick vampire bit would have ever been in the realms of possibility before today. First time for everything, he guesses.

With the high pain tolerance he's been blessed with, Cassidy does his best to shove aside the underlying ache of that bite and suck to instead focus on Eccarius mouth and that impressive ability. The blood sucking itself isn't entirely uncomfortable, although admittedly an unusual feeling, but he focuses in on it, huffing out soft groans that occasionally border on pained, as his fingers comb appreciatively through his partners long hair.

"Christ, not gonna... gonna last much longer, love." Having the blood sucked out of him may be a bit of a literal erection killer, but he's still perfectly capable of enjoying himself.