Have her kneel in front of me

I don't immediately reply, but instead I walk up and stand in front of Millie. I look her in the eyes, then I look at her tits, and I cup both her tits and start squeezing them. This surprises Millie a bit, but she rapidly regains her composure and just stands there while I fondle her tits.

I lean in to kiss her, but she turns her head away. I put my hand on her shoulder and gently push her down.

"Get on your knees." I tell her.

Millie complies, and slowly drops down on her knees. Millie is now kneeling in front of me, so I unbutton my pants, and Millie flinches a bit as my hard dick comes out of my pants to avoid it hitting her in the face.

Millie's face and my dick are exactly at the same height, and she is down there looking at it.

"Suck it." I tell her.

Millie slowly moves her hand and takes hold of my shaft, she starts to jerk it slowly, then her other hand cups my balls and starts squeezing them. She looks a bit disgusted as she stares at my dick in front of her face.

"Suck it!" I tell her again, a bit louder.

Millie looks up at me with a "I don't want to do this, but I have to" look, then looks back at my dick. She leans forwards, her mouth opens up and my dick goes into her mouth. She takes the mushroom in her mouth, then starts bobbing her head up and down on the mushroom while jerking the shaft and playing with my balls.

This feels quite nice, so I enjoy this for a while, then I grab both her hands and pin them to my side. Millie looks up at me, my dick in her mouth, with a questioning look.

I look back down at her, and say:

"It is a blowjob, not a handjob, use your mouth."

Millie looks back down, and starts sucking my dick using her mouth only. At first she is only sucking the head, but as she picks up the pace she starts going deeper and deeper, until finally she goes about halfway down on each lounge with her head.

Millie moves her head back, then says:

"Matt, I am late for my study group already, can you please hurry up and cum?"

I reply: "You are doing well, keep sucking it like that and I'll give you my nut soon."

Millie looks up at me, then, as she is moving her head towards my dick to start sucking it, she says:

"Don't cum in my mouth."

She does not wait for me to reply, instead she starts to suck me again. Slowly at first, but she quickly picks up the pace. She is sucking me really well, so I feel like I will cum soon. I let go of one of her hands, and she uses it to cup my balls, squeezing them gently as she is sucking. This enhances my pleasure, so I release her second hand to see what she will do with it, and she takes her thumb and forefinger of that hand and massages the root of my dick, using her mouth to stimulate the rest.

I am getting very close now, so I need to decide where to cum.