>>11491407This. It's just playing pretend because of "no fraternizing with opposite sex" rule universal to the Idol genre and lifestyle. This makes yuri RP more entertaining because it seems like they're tasting forbidden fruit. And also just another aspect of interpersonal chemistry, the bantz between Pekora and Marine during drawing stream, are very entertaining, even though "nothing happens".
Allegedly, Japanese boys will sometimes pash each other in front of the girls on a dare, to show they are sophisticated and urbane and ain't afraid of nothin'. It's doesn't mean they are actual homos or don't like girls, but rather do it precisely to surprise and impress the girls.
If the Hologirls were screwing around like actresses in Hollyweird it would ruin the whole phenomenon of them being playful, wholesome entertainers. Hence no real lesbos.