Hey guys, long time no see. My chinchilla, Dex, is an unneutered 5 year old male, so naturally he has some humping tendencies. Usually after a while of me pushing him off, he'll lift his hind legs to pull out his tool, but tonight when he pulled it out his whole body was visibly shaking/vibrating a couple of times. Then when it was out, I noticed it had a couple of lumps/spherical bulges in his shaft. He then proceeded to clean it in his mouth, as he does, and then went to lay down. I'm assuming that he "took care of himself," but I wanted to post this question in case this is something more serious that I need to get him checked for.
This is a weird question to ask about, but I appreciate any and all input.