He'd told Lance to pull out, that he didn't want him coming inside him, didn't want to be knotted. But he supposes this isn't too bad. It's not horrible, laying here in the soft, calm aftermath, being cradled to the Alpha's chest as they wait for the knot to go down.
It's nice enough. The knot feels good; he likes the feeling of being plugged up and full of his Alpha's come. As much as the logical side of him doesn't want to be knotted and bred, the emotional side - the Omega part - loves it and preens at the feeling of being full.

Lance stretches his body out, nudging his cock further inside Matt. The Omega gasps, his vagina walls insanely sensitive after being driven to orgasm three times in the last half hour. Lance shushes him, reaching a hand up to brush unruly hair out of his Omega's face and leaning over slightly to press a soft kiss to Matt's cheek. The same hand then trails down the Omega's body til it rests on the slight swell of his stomach, swollen from the amount of come being pressed inside him by the Alpha's cock.

"I can't wait to see your belly swell with our perfect babies," the Alpha croons, low and sweet, in his ear.

Logical Matt would be scared by those words, turned off. He's never wanted pups, never wanted to have any of his own. And now he's fighting an intergalactic war. He's a dirty guerilla fighter. He doesn't have the time or luxury to get pregnant.
But Logical Matt isn't in control at the moment. Omega Matt is. And Omega Matt absolutely preens at those words. He snuggles in closer to his Alpha, purring. The thought of pups makes him so happy. And he has an insane urge to clench down on his Alpha's knot, make sure it stays in him as long as he can keep it there, long enough to let the Alpha's seed work.

But it's alright, because Lance's knot doesn't seem to be going down any time soon. The Alpha pulls his Omega in impossibly close, so close he's almost laying on top of the tiny rebel. With both arms wrapped protectively around Matt's torso, the Alpha starts rocking his hips back and forth, gently humping the man underneath him. Matt's walls are sensitive as hell, but his inner Omega is too busy preening and purring to care about the leg-jolting pain.

"You really... really think.." Matt whispers curiously.

"Babe, by the time I'm done with you tonight, there's no way you won't be pregnant," Lance hums as he continues rocking. "I'm gonna fill you up with so much come, you're gonna look pregnant just coz your belly's gonna be that round with come. You're getting bred good and proper tonight, Omega".

Lance's words are thrilling and terrifying. He's not ready for this, not ready for pups and pregnancy and commitment, but oh, does he want this. He lets the Alpha's soft crooning and gentle rocking soothe him, and he settles into a sleepy daze.