STEVE HARRINGTON IS A LOVER AND SO I PROPOSE:
Him crushing so hard on Eddie. Just head over heels kind of crushing. And Eddie's teasing him and lightly jabbing at him and being his usual sarcastic, nerdy, charming (in that unintentional way) self. So Steve just grabs Eddie by the face—mid-conversation by the way—and peppers Eddie's forehead, cheeks, and nose with little pecks.
He pulls back and has this embarrassed, overwhelmed blush on his face. There's hearts in his eyes. And he can't stop himself from smiling, so he's trying to close his lips around his teeth, but he can't!! Because he's grinning too big!!! Because he's in love!!!
And he pulls his hands away and they're shaking a little because he's so nervous and jittery and—again—IN LOVE!! So he starts fidgeting with the sleeves of his jacket or plucking the fabric of his shirt or running his fingers through his hair.
And then Eddie grabbing him back just as fiercely, but giving him a big smooch on the lips instead!
Steve is just literal jello at that point. Completely weak in the knees, ends up needing to grab on Eddie's elbows or shoulders for support. He's giggling through the kiss and he won't close his eyes because he wants to see Eddie's face and he's so overwhelmed with love in his heart. He's warm all over and he can't stop giggling and he's trying to catch his breath, but it's almost impossible. And, y'know what, he'd probably start stimming honestly—like rocking up on his toes or scrunching his fingers in Eddie's shirt or continuing to huff little laughs or something.
HE IS JUST EXPERIENCING SO MUCH LOVE AND PASSION THAT HE HAS TO GET IT OUT!!! Cuteness aggression! Steve has cuteness aggression! He's a little lovebug! He's wearing his heart on his sleeve! He gets an upset stomach if he feels like he's about to be rejected! He literally can't calm down or be normal if somebody reciprocates his feelings! He's like a high energy dog that needs to take a run around the park before he can get anything done!
He is always up for a kiss. He's a touchy guy—petting his hand down his partner's back or lifting them in the air or dancing with them or walking arm in arm with them or hand holding or piggy-backing or cuddling on the couch or or or
Steve would be such lover boy and Eddie needs to be hit with the force of his love! Steve's a sun-powered laser beam of love and he is charged up!