Can I loan my iBook ?

iBooks are linked to your iTunes account and can't be loaned to another account

Only by using the same Apple ID. Sorry...

Thank you for your input- Is there a way to put my boyfriend's ipad ID on my ipad? I wanted to transfer the book i downloaded on his ipad to mine.

Ya log into your account on his iPad go to that iBook and download it and he will have it. Hopped this Helped