Biting.... Aggression? Playing?

[ChelseaH18]

He's the one doing the grooming though. He'll start to lick Seraph, and then almost immediately just start biting him. It's not a slow or gradual build, or just tired of what's happening, it's like he pretends to start grooming him to get his guard down and then goes for the throat lol.

[Medusa]

I have a couple of cats that do the same thing. No aggression, etc., just suddenly they clamp on and won't let go after grooming another nicely. I think it's just rough play; at least that's what it seems like w/mine anyhow.