Public tweet:
https://x.com/GodEmperork/status/2039513582870876509?s=20
Requested this a while back as a joke. Was going to be Aqua (because of the author commenting Subaru would fall in love with her) and Albedo (since she is the other crossover heroine from Isekai Quartet) but I wanted to get art for Eris and Beta.
Works in my mind since Mushoku Tensei and Re Zero have had a few crossovers. And Beta shares some traits with his canon love interests, Emilia and Rem.