You're a real love or relationship guru ! I'll miss you.Why would Shinobu care about some characters if they are nothing?
The logic here can't really apply. You don't have to be an item to not care for someone. One key thing to note is it's known Fuckboi sucks at romance. Hence his admitting to using force on Sakura to Blondie in the sex scene which explains why he was so aggressive to her in his actions as I always suspected.
You don't have to be in a relationship to not care for someone. We've never seen Sakura reciprocate those feelings just like with Shinobu towards Fumi. Again it's a parallel.
Fuckboi cares for Sakura in his own way even if it's not that well shown or displayed. I wouldn't put it past them if they're lightly dating but Fuckboi's being unsure of their relationship shows it's not something simple. Why else would he be unsure of how to respond?
Thank you for your comments citing about normal people's relationship and behaviors as usual.
Your comments always remind me that Grapara is insane because its characters behave like they're abnormal people (mentally ill) though it's the story about normal people in modern JP society. LOL
You seem more like someone who works in HR than on the production line. That’s a compliment, not trying to be funny. LOL
Thank you and please take care,