Truly, the only sweet wine kits available are the "mist" type kits (Orchard Breezin, Island Mist). They ferment a base grape juice to dry and get their sweetness and flavor by adding in a quart or so of a flavoring pack. The flavoring pack has sorbate to arrest any further fermentation. Tha alcohol is low and the flavor is strong so that the wine is easy to drink in 5 or 6 weeks. They are super-easy to make.
Other than those kits, you might find a few kits that claim to be semi-sweet, but thats stretching it for someone that only drinks sweet wines.