Horocycle flow at product of two primes

We show that if $\mathrm{\Gamma }$ is a co-compact arithmetic lattice in $SL(2,\mathbb{R})$ or $\mathrm{\Gamma }=SL(2,\mathbb{Z})$ then the horocycle orbit of every non-periodic point $x\in SL(2,\mathbb{R})\mathrm{/}\mathrm{\Gamma }$ equidistributes (with respect to Haar measure) when sampled at integers having exactly two prime factors.