texthusiastic
(adj) enthusiastic about texting. A texthusiast is someone who replies to your texts promptly and is eager to carry on the conversation.
Guy A: How's it going with that chick you met last night?
Guy B: She's a little lukewarm, seems like she's not terribly texthusiastic.
Guy B: She's a little lukewarm, seems like she's not terribly texthusiastic.