How to write couplets on ordinary red paper without wrinkling?

No, I often write like this. Paper is plain paper, pen is plain pen, and ink is bought from a bookstore. There is no need to add anything. It's just that the writing table is a little long, with red paper on the left and written couplets on the right. When writing, press the paper with a press, pull the two words forward, let them droop freely, and then move to the right after writing.