Based on the roleplay with Emo_girl3365

Ever since you have a crush on blurr, sideswipe would tease that blurr likes you which got you to tickle sideswipe non end

Sideswipe: stahahahahahahaaap!!! Plehehehehehehease!
You: only if you promise not to open your big mouth about me and blurr!
Sideswipe: okokok! I prohohohogomihihihihihhise!

You stop tickling sideswipe while sideswipe tries to catch his breath. Later on that night everyone went to sleep in the scrapyard. You are fast asleep in your room and , unknown to you, blurr activated his human form and snuggled onto you. Next day you wake up and see blurr fast asleep. You decide to tickle him

Blurr: hahahahahaa! Y/n! Stahahahaap!
You: *stops tickling* morning, blurr~
Blurr: good morning, sweetspark~

You ad blurr kiss feverishly until it turns into a heated make out. 3 weeks later, you ad blurr give our the news.

You: I'm pregnant

Team bee, Denny, and Russell cheer while blurr hugs you in happy tears.

Sideswipe: I knew you can start a new family, blurr
Blurr: OK come here!

This time blurr tickles sideswipe as payback for saying something cheeky about blurr and you thus sideswipe broke his promise. Oopsy.