From what I've seen on Literotica, which is the only place with a substantial Indian English erotica community as far as I know, harem isn't something they have. Then again, even Western eroticas tend not to have harems. If it's aimed towards women, harem won't be too popular I imagine, the character insert is supposed to be male. Kiss Him not Me was a reversion of the trope but even that was only popular because it was meta.
Compared to harem or male oriented ecchi, shoujo is very unidimensional as far as the romantic interest goes. He has to be a tall, chiseled, rich, mysterious guy who is popular with the ladies but cares only for the reader insert.