in 花言葉, it means "memories of the night" and "bewitching"
(hmmnn...what kind of memories....👀💦

well apparently moonflowers exist and can refer to several kinds of night-blooming flowers xD
the one on r!ciel here is the Ipomoea alba (ヨルガオ), which emits a sweet fragrance when it blooms at night
(i think the twins both smell sweet hehee🤤🤤🤤)

i had to draw sebas-chan tentacles after seeing the july Gfan cover XD