AWESOME result!! 
This taken is from my "Belial Files on the kinds of offerings I’ve given him:
Sacrifice
He enjoys being offered things you wanted for yourself, such as half a tub of posh ice-cream I was saving, which makes me think the emotion of sacrifice is more important to him than superficial flashiness - kind of like the story about the widow’s mite.
△ Artist’s impression of this author, making tough decisions on demonic sacrifices!
I’ve offered him reddish-coloured things and he likes those, and he’s also said he’d very much like me to engrave his sigil in metal, aluminium in this case, so that might be a payment to offer him if he comes through with an important task.
Don’t offer it beforehand, he seems hard-headed and not the type to expect something for nothing. And don’t offer him anything unless you mean for it to become his.