How would you handle wording this situation into a lease?

[Tyler Brown]

I have a single family home that's rented out to three college students.  They're all on one lease, jointly and severally liable.  They're Person A, Person B, and Person C.

The lease is up on April 1st.  I recently reached out to them to see if they were interested in renewing for another year.  Person A and Person B would like to sign another year long lease, although Person C is only looking to stay until around June or so, at which point he'll move out and Person A and B will have a new roommate move in, who would be Person D.

This is all fine by me.

However I'm not sure how to handle the lease renewal.  I'd typically just send them another year long lease, running from April 2018 to April 2019 to sign with all their names on it, but then that'd lock Person C into staying all year.  It also leaves nowhere to add Person D.

I also don't want to create a lease that just runs from April to June because that would give Persons A and B a chance to change their mind at the last minute and decide to move out as well in June.

Thanks for any suggestions.