Why not go for an adopted Father situation or maybe where the father secretly hates his son because during child birth, the mother died and that the father never really wanted a pup. however the father still raised Asp because that is what the mother asked of him with her last few breaths?

I meant physical quirks, not so much a history thing. Apologies if my post isn't clear. This is what I have so far:

Slight belly.
Minor modularity (since Aperio has the gene as well)
Rather girthy with his breeding pole.
General wear and tear from being older.

Like to try again? ^_^

Yeah, General porn star DILF qualities. charms enough to swoon any prey he is after, enough smarts to hold his title as Doctor. as well as having several other Doctorate degrees. Hung like a horse. Smooth but low voice, grey/silver fur in places too. Tall, toned and in shape but still having some older person sag and weight put on. The Modular Gene thing would make for some really kinky scenes so that works. Basically, the kind of manly man that all other men want to be.