Inshoku no Mahou Shoujo Tentacle!

Novice idol Azusa one day found a strange creature in front of her home that could speak in human language. It called itself "Nurupon". Nurupon requested (forced?) Azusa to change into a magical girl so it could wriggle its tentacles into her womb. Azusa resisted but was transformed... into Lust Limbs Magical Girl Tentacle, defender of her last shred of chastity!