A periodic carpenter

"Some sort of modern periodic carpenter?"

"Oh for god's sake!" Caoimhe says, rolling her eyes. "You're definitely not getting a blowjob."

"Oh come on! I don't want blue balls!"

"Well then you should've taken this seriously. I'm dedicating a lot of time to helping you. If you're not even going to try, there's no point."

"You're right, I'm sorry! Can we try again?"

"I'm afraid not, baby. If I give you another try, you won't be motivated. Half an hour of studying Chemistry, and we try again, OK?"

"That's fair. I deserve that."