This is very creative. I'm sure you got talent. Have to say, sometimes I need someone to write my paper when I organizing lesson for writing love poems. Here are some tips.
Gather poetry books that focus on love to share with the students. A great website for classic love poems is 100 Greatest Love Poems Ever Written
Ask students to bring in their favorite love song lyrics. Remind students that song lyrics are poetry. Then, make a packet of school-appropriate lyrics to share with classes. Also, ask students to bring in CDs of their favorite love songs to play when the students write the poems in class.
Create a rubric. Grading poetry can be somewhat subjective. It is best to decide on the criteria and the level of quality for the poems before students begin writing.
Design handouts for the students that explain the love poem assignment. To tie this lesson in with standards, discuss poetry techniques.