Who Tacking Cares?!

Requested by @Reader116 (but fully from my overactive imagination): BillyBob the unicorn and his pregnant boyfriend Llama the llama lived happily in a pineapple with their owner-thingy Anna. That is, until a tragic accident caused BillyBob to fly away on a chartreuse balloon, leaving his lover behind... The rainbow unicorn must overcome many adventures to return to Llama, but will he make it back in time?

Warning: Boy- MaleXMale, MPreg, extreme strangeness, and overuse of the word "lustrous" and synonyms.