After Jeffrey broke the ice, Tom received a few more half-hearted "Hi Mr. Purcell's" as the rest of the students filtered in. Tom waited a few more mi...utes to make sure all the stragglers had a chance to find a seat. "Okay, happy Monday everyone," he started, waiting for the few mumbled responses. "Let's get started. This week, we're continuing our discussion of limits and moving into derivatives. Who can tell me the general formula for a derivative as a limit?" There was a long pause, most of. Black jeans, large shiny belt buckle, dress shirt and boots. The look in his eyes had her pinned to her seat, all thought process halted. With a slow grin he leaned over her shoulder from behind, placed his hands on her waist and looking straight down her shirt, he nipped at her neck before sitting beside her. He smiled and leaned over placing a hand on her thigh and whispered in her ear, "It appears you decided to wear what I picked out for you. I know you understand what this means?" Shay. "Why not?" Whitney said, indignantly. "You showed it to Kayla."All four females were now looking at his groin, and Kayla had a chicken shit grin on her face.Jeff pushed Nicki to her feet, then stood himself and swatted Kayla on her butt. "Get showered and get some clothes on so we can get something to eat." Didn't take you long to get her out of her clothes, Dad," Arlene said from the doorway, not even bothering to try and suppress her grin."Don't start," Jeff said as he passed her on the way. Each thrust pressed against her in just the right way. Her squeezing his cock with her pussy was making him ready to explode. Just then he felt her breathing stop and her body shiver and quake. Her cunt spasmed around his prick and he felt a flood against his cock. He couldn’t hold out any more and he unleashed his own geyser deep into her hole.He continued thrusting into her, though more stabbing her with short hard jabs as he came. As his cumming subsided, he pulled his legs up and apart.