Rob Kardashian Takes Future Stepson King Cairo To Trampoline Park — So Adorable

Rob Kardashian is already off to a GREAT start as he transitions into his role as stepdad for his fiancée, Blac Chyna’s, son, King Cairo. From toy store visits to Legoland fun, King and Rob’s LATEST adventure together was all about letting loose at a trampoline park. And apparently the pair had an absolute ‘BLAST!’

Rob Kardashian, 29, and King Cairo, 3, make SUCH an adorable pair! There’s no doubt Rob has totally stepped up as a parent figure for his fiancée, Blac Chyna‘s, 27, son. And honestly, fatherhood looks pretty great on the reality star! The stepdad/stepson pair even stepped out for a fun trampoline date on April 27 and, according to an eyewitness, Rob is ALREADY a “doting” father figure for the tyke. Aw!

The Keeping Up With The Kardashians star was spotted leaving Sky Zone Van Nuys, a Los Angeles-based trampoline park, with little King on the evening of April 27. The pair reportedly arrived around 5:30 p.m. and were seen leaving at 8 p.m — that’s a long time to be bouncing around, the two must have been having loads of fun!

But the duo weren’t COMPLETELY alone, joining them was a mystery woman who is believed to be the 3-year-old’s nanny. An onlooker even revealed to HollywoodLife.com that Rob and King had a blast together, with Rob holding King’s hands while he jumped on the trampolines — how cute is THAT?

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The eyewitness also described Rob as a “doting future stepfather,” and we have to agree! Since Rob and Blac started officially dating back in January, Rob has seemingly jumped RIGHT into fatherhood, full-steam ahead! He and King have enjoyed toy store visits together, Legoland, and have even played together in the backyard. Blac and Rob also surprised little King with a trip to the local fire station earlier this month, and back in March, the family celebrated Easter together.

We just love that Rob seems to truly be enjoying step-fatherhood! King Cairo is the biological son of rapper Tyga, 26, who has been dating Rob’s little sister, Kylie Jenner, 18, after he ended his engagement to Blac. And while all that MAY sound a bit complicated, all parties involved seem to be adapting fairly well to this new dynamic.

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But Tyga has made one thing clear, that HE’S the the true father of King and nothing will change that. “Tyga told Rob straight up that he’s King’s dad and no one will replace him,” an insider told HollywoodLife.com EXCLUSIVELY. “Tyga laid down the law with Rob, setting some ground rules. He told Rob he doesn’t want him smoking, cursing, and most importantly, kissing or doing anything sexual with Blac in front of King.” So far so good, apparently though. Rob seems to be a great stepdad!

How adorable are Rob and King, HollywoodLifers? Do you think Rob will make a great parent?