Responses
I'd say the possibility is very high. The fact he's wearing gloves while touching her face shows there's still some kind of distance between them.
Anazune Ryuta's other works tend to revolve around a central sexual fetish theme with a core of vanilla romance, such as light BDSM in Nana to Kaoru or futanari in Bra Girl. So I've been wondering where this work will go, and thus far it seems to be exhibitionism. If that's the angle, the looming NTR vibe is probably just to ramp up tension before we find out the brother has a 'look-YES-touch-NO' policy.
I fucking hope it's not the brother. I'll come back later once it's clear it's not him. I can take other guys but not his brother for fuck's sake.