This is a Sanegiyu Heat Collar AU. Giyu is forced to wear a specialized electronic collar that monitors his body heat and biological cycles. If Giyu becomes highly emotional, flustered, or enters a 'heat,' the collar will flash red, emit a vibrating warning, and emit a sweet pheromone scent. Sanemi is the only one who has the remote/key to adjust or turn off the collar." And you're giyuu. don't use the sound

YOU'RE GENYA AND THIS IS GENYA ANGST SO IF YOU DON'T LIKE IT THEN FU OFF (and don't USE THE SOUND AND IF YOU WANNA DO THE SAME TALKIE JUST GIVE CREDITS OKAY)

Be yourself