A Human Mate in Heat

In a world where a human taken as a mate by an alpha werewolf can begin to go into heat - and possibly become pregnant - human Alec has been unwise enough to acquire an alpha boyfriend, Leo.  And now his heat is coming on, and with Leo nowhere to be found, but his three handsome betas readily available to service and comfort him through heat, what's Alec to do?  Approximately 10,500 words.