DoL(Degrees of Lewdity) is similar though slightly more odd. Personally I like them both, id give a slight edge to DoL only because it feels more complete
It has a few LIs and pregnancy
thank you for the suggestion. i've tried dol now, and while technically it's a very similar game to cot, the two could not have been more different emotionally however: where cot creates a playful, fun atmosphere of exploration of hidden but not exactly dark parts of the life, dol from the very start has appeared depressing, hopeless and full of mindless child abuse; i could not bare it for long and had to uninstall. two very different experiences indeed.