The rationale set out in these cases applies here. While the Davidsons did not plead a claim for rent and possession under Section 535.020, RSMo 1994, the facts which they pleaded and showed stated such a claim. Although the Davidsons are currently in possession of the property, they are still entitled to recover unpaid rent. It is unclear when the Davidsons first orally requested Mr. Kenney to pay back rent, but in any event their service of the summons following the filing of suit in November 1996 constituted adequate demand for rent due. Rent was unpaid for the months of October, November, and December, 1996. See Charter Oak Inv. Co. v. Felker, 231 Mo.App. 848, 96 S.W.2d 887 (1936). Moreover, they are also entitled, *901upon a showing of negligence, to recover for damage or waste to the property beyond reasonable wear and tear. See Enchanted Hills, Inc. v. Medlin, 892 S.W.2d 722 (Mo.App.1994); Brown v. Midwest Petroleum Co., 828 S.W.2d 686 (Mo.App.1992).