Just a little chorale. But what happens when you split the [S] out as a lead, the [B] out as a bass, and make the inner voices a comping instrument?
Cute.
Starting from the part-writing rules of the Common Practice Period, I added N.C.T.s to minimize the presence of the leading tone (not entirely), then to add as many 7ths as I could (not many), then include as many 4-3 suspensions as I could. Here's what you get.