The transparent human

Subject A bought new shoes
Subject B is ill
Subject C sits on a hill
While listening to blues

Subject  D and E are brothers
Subject F loves subject G
Who left her for subject  H
But now they're seeing others

Subject I's on holiday
Showing her bikini
Subject J says she's a meanie
For not taking her to the bay

They think they're free
But the scientists watch every motion
Writing down all of their notions
And that's all there'll ever be