Vampire Vic by Harris Gray

Would you give up donuts for blood? 
Fat, balding accountant Victor Thetherson hoped becoming a vampire would turn his life around.  But Victor can't stomach confrontation and gets queasy at the site of blood.  Instead he gets it from the blood bank, diluted in bloody Bloody Mary's.  The result: a vampire who doesn't bite and a man who gets no respect.
Victor's slacking staff mockingly call him Vampire Vic.  Victor's boss amuses his wife by intimidating Victor on video.  His ex makes him stay out late while she entertains boyfriends in the house she insists they continue to share.  One night it finally boils over, and Victor bites someone.  And then another...and very soon he's no longer visiting the blood bank.
Muscle replaces fat and his comb-forward widow's peak takes root. Victor basks in newfound attention and respect,at the office and at home.  But real vampires get hunted, and as the transformation reaches the tipping point, Victor must decide how much he's willing to sacrifice for the power of a vampire.