Allergy with aphrodisiacs makes the insertion more sensitive -Slurpy orgasm even with misunderstanding

"No...... wait. If you put your tongue in...... no!" –One day, it was decided that Rina was staying at Tatsuya's house since her parents went on a vacation. Tatsuya is nervous about his childhood friend's first visit in a long time and is about to make coffee when he notices a strange shaped sugar on the shelf. The package said it was sugar, so he...