Yule Octopi My Heart by K.L. Hiers

Ozzie Silverman is doing his best to prepare for the holiday season, but it’s not easy being a grumpy witch who despises everyone outside his immediate family. He has to prepare for the Winter Solstice, get in some last minute shopping, survive his grandmother’s dreadful fruitcake, help out the intergalactic tentacle being—

Wait, what?
Tuesday is a bubbly and chaotic alien who’s on the run across the universe from his ex-boyfriend, a malicious conqueror of worlds who’s hellbent on them getting back together. Tuesday desperately needs a place to hide, and his unique charm is impossible for Ozzie to resist.
Plus Ozzie can’t say no to a cute face—even one with hot pink tentacles.
Things heat up as Tuesday melts Ozzie’s prickly defenses, but even the magic of the season might not be enough to save them when Tuesday’s crazy ex shows up and announces he’s going to destroy the world on the twenty-fifth of December. Time is running out and Ozzie is desperate to protect Tuesday, but he might have to do something even more impossible than defeating an homicidal intergalactic overlord:

Tell his family he brought an alien home for Christmas dinner.