Obviously

After a couple pictures you scan through the recents and notice pretty poor work, but your eyes have been more focused on the live naked girl with her tongue not even an inch from your cock than where the camera lens is pointed. You pretend to fiddle with it but use the camera to check her out, noticing a bead of precum forming on your tip. Her eyes have been focused on your junk and she moves her head slightly to maintain distance from your cock. An idea hits you.

"Alright eyes up, look at the camera," you tell her. "Gives the illusion of eye contact and increases intimacy of the photos."

Beth looks up to you and you seize the chance to 'accidentally' bump into her with your cock, wiping that bead of precum directly onto her tongue. She backs off and sputters, almost spitting up.

"You alright? Sorry, didn't notice how close I was getting, but can we do that again? That might have been the highlight of this series and I didn't get a picture of it," you tell her. As she recovers from the shock and disgust of having tasted your semen, you expect her to call it quits. Just for good measure you add in, "I think this series might actually get me into my classes alone."

Beth clearly wants to help you and that last sentence sways her, "Um, alright, yeah I guess. Is there something we can use to wipe off your...thing?"

"Sorry more will just come out, but the quicker we do it the less that'll end up on your tongue," you say. Without waiting for a reply you shift forward and, after a moment's hesitation, Beth sticks her tongue out. You lay your cockhead directly on her tongue and are surprised that you don't explode right then and there. Your camera clicks repeatedly as you record this.

"Ok cool, do you mind acting as if you're sucking the penis? Don't actually give me a blowjob of course, I wouldn't want to cheat on Eve, but if its for the photos she'll understand," you try to push her a little more.

"This...is a little far. But if it's for your class and not some sick fetish thing, I guess I can. Not a blowjob right?" Beth reaches towards your cock with the hand previously fondling her own chest.

"Of course, I'm not getting pleasure out of this besides the pleasure at securing my future photography classes," the lie comes out easily with your nut on the line. She touches your cock lightly - being a lesbian she's a complete amateur, but the situation more than makes up for her lack of experience. She strokes your cock a little before licking around the tip. As much as you enjoy it, you're having a hard time holding on. You use your free hand to hold the back of her head and push your cock deeper into her mouth but not all the way.

Her eyes widen in alarm but thankfully in the instant she looks at you, you pretend a professional demeanor more focused on the camera than what's happening to your cock. She relaxes a little bit so you start thrusting in and out of her mouth shallowly.