Casas definitely do this, provided the girls are like each other. Not all girls are willing, and some have better rapport with certain girls.
As for safety, casas are pretty much the best route. You might be able to make this happen at a club but it will be even more expensive.
Also, it is good you can't do this in your room. Multiple girls back to your room is bad news unless they are really well reviewed girls. That is how guys get drugged. One distracts while the other slips something in your drink.
Just stick to well reviewed girls. You could always ask a girl if there is a girl that she likes to do trios with.
Further, there are many trio reviews in this forum here. Also, in the review it should show if the girls just both had sex with the guy, or they also interacted with each other (as you want).
Here are two recent reviews. The girls in these threads are pretty well reviewed so I'd feel comfortable going to see cristal/ela at their place. Tatiana works out of a hotel downtown that many girls work at. Just set something up for the daytime and you should be fine:
Buenas noches, Catadores. Quisiera compartir con ustedes un trío que jamás pensé qué iba a tener pero cuando las cosas pasan, pasan es por algo. En vista del retiro próximo de Ela, yo quise proponerle un trío con Cristal con quién ya he tenido varios encuentros y sabía que se le mide a los...
catadorcolombia.com
NOMBRE: Dulce María y Tatiana NUMERO: 3104197367 (dulce) https://co.mileroticos.com/escorts/catalina-hermosa-seductora-super-parchada-fotos-100-reales/25479998/ https://co.mileroticos.com/escorts/desde-50-mil-en-lo-adelante-rica-y-en-calor/22486073/ TARIFA: 350 / una hora EDAD: Dulce 27 -...
catadorcolombia.com
There are more reviews to read if you just go here and scroll through
https://catadorcolombia.com/forums/reseñas-en-medellín.5/?order=post_date&direction=desc