public class Facade {


    handleSomeUC(args) {

        SomeUCContext ctx = createSomeUCCtx(args)

        ctx = serviceA.doStuff1(ctx);
        ctx.fieldX = true;
        ctx = serviceB.doStuff2(ctx);
    }
}

public class ServiceB {

    SomeUCContext doStuff2(SomeUCContext ctx) {
        ctx.fieldY = fkn1(ctx.fieldK)

        return ctx;
    }
}