Uraraka wasn't sure if Toga could feel how fast her heart was beating just by leaning in to kiss her. Her face was already burning with embarrassment before her lips finally touched the other's softly after hesitating for a few seconds.
Toga happily returned the kiss with Uraraka! Given how close she was with that chest against Toga's back, she definitely felt the increased heart rate.
"Seems like you gave it your all...~"
She couldn't help but tease before kissing those lips once more.