Spike purr-growls and hisses lightly at the touch of her nails.  He starts moving in and out of her, the pace quickly becoming a hard and fast one, dictated by the demon. He continued to nip and lick along her jaw, onto her neck, along her collarbone.  Possessive nips, as if trying to taste her everywhere.  Then he finally licks hard over the Claim mark, hitting the new nerve connections made there.