Yes, with both

"Alright nice, now could both of you stand side-by-side?" you ask as they do so. They smile for the camera and you take a picture. "Now Beth, you're a bit taller than Eve, could you put one arm around her?"

Neither girl thinks this is weird even though both are nude - the nudity being so normalized now that it doesn't come off as sexually charged. Yet.

"Perfect," you say as you raise the camera. You feign dissatisfaction though and lower the camera, squinting as if scrutinizing the situation. "Actually, could you guys play with each other's nipples? Need them hard for the shot."

Beth hesitates before saying, "We can just touch our own, right? No need to feel each other up." She reaches up to start playing with her own nipples.

"No! I mean, uh, I think the overall mood of the shoot should follow some sort of narrative," you try to explain. "Photography is as much what happens behind the scenes as what's in that moment that the photo is taken. If you guys get more comfortable with each other, it'll reflect in the photos and look more authentic."

Though they know next to nothing about photography you kick yourself for such a flimsy excuse. The skeptical look on Eve's face tells you she agrees, and she opens her mouth to protest, before Beth interrupts her.

"Okay yeah, that makes sense," Beth says as she starts playing with Eve's tits. Eve's eyes bug out a little before she goes along with it and feels up her friend Beth. You greedily take photos of the two coeds touching each others' chests as your cock tries to break free of the confines of your pants.