Part of Koishi's second bubble in the second frame is an infamous Japanese Spiderman quote (「すり替えておいたのさ!」 or "I secretly switched them!") among Japanese netizens.
I can unfortunately not post the clip, since they usually get deleted swiftly.
And of course, Onee-chan. I made you subconsciously wear my underwear!
A parody of TŌEI spiderman's quote..HEEEEY!By the way, I'm wearing your panties from yesterday. The ones you removed to bathe!❤
What if the subconscious brings a miracle...KoishiPoofand gets me one of Onee-chan's babies?
I... ❤
I.... ❤Huff ❤QuiverHey!? Without my permission?
Wait a minute....
Where!?AHHHHI borrowed Onee-chan's clothes! ❤You're such a dummy, Onee-chan.
I already swapped my clothes.
In other words, it's the insides...
Yes, your panties... ❤