Disclaimer: I own nothing in connection with Dragonball Z, nor do I make any money writing this fanfiction.
Scratch the Surface
At first Vegeta thought it was just Kakarott being... not Kakarott but Goku. All smiles and nice words and pats on the back. Then Vegeta quickly came to see other things in those actions. Those smiles sent in his direction had a particular hunger, those words were spoken with a glint in Kakarott's eye which raked over his body and the hand patting his back lingered for just a little longer than it should need to.
Vegeta turns away with a huff and then, when nobody can see, smirks. He'll keep having Kakarott try that little bit longer. It's fun.