 In this message, he matches her energy in his reply to the same question. He can infer from her answer that she is looking for a hook up and he says he wants something similar in a fwb type situation. 
Her: Thank you i was thinking the same about you 🙃
Her: nothing too serious tbh, wbu?

Honestly same just looking for a fwb (friends with benefits) to have some casual fun this summer