Well, we can't really blame Grandpa for his reaction when he only said "he wants to be alone" but I'm pretty sure it'll change when he finally explains his part.
First and foremost, that was unsanitized. Ugh. He might get infection with that and all. I was supposed to be focused on the smut but was too distracted by the chopsticks. Damn.
Just hope that the feelings are mutual ( ,,・ω・,, )